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**82498/493   Cache Controller / Cache RAM (for P54 Pentium)    <Nov94
***Notes:...
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**
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**?????  (Profusion)    c:99...
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**W86C452   I/O controller for IBM PC/AT                         Jul89
***Info:
GENERAL DESCRIPTION

The W86C452 is an enhanced dual-channel version of the popular W86C450
asynchronous  communication element  (ACE) fabricated  using WINBOND'S
CMOS process.  It is  equivalent to VL160452  of the  VLSI Technology
Inc.

The  device   supports  two  serial-to-parallel   conversion  on  data
characters  received  from  a  peripheral  device  or  a  MODEM.   and
parallel-to-serial  conversion on  data characters  received  from the
CPU.

The CPU  can read the complete status  of the UART at  any time during
the  functional operation.  Status  information reported  includes the
type and condition  of the transfer operations being  performed by the
UART as  well as  any error conditions  (parity. overrun,  framing, or
break interrupt).

The UART includes  a programmable baud rate generator  that is capable
of dividing the timing reference clock input by divisors of l to (2^16
-1), and  producing a 16 x  clock for driving  the internal transmiter
logic. Provisions  are also included to  use this 16 x  clock to drive
the  receiver  logic.   The  UART includes  a  complete  MODEM-control
capability  and  a  processor-interrupt  system.   Interrupts  can  be
programmed  to  the  user’s  requirements,  minimizing  the  computing
required to handle the communications link.

In addition  to its communication interface  capabilities, the W86C452
provides the user with  a fully bidirectional parallel Centronics type
printer.  This part  allows  information received  from either  serial
communication port to be printed from the dual ACE.

***Versions:...
***Features:
o  Easily interfaces to most popular microprocessors.
o  Dual-channel version of W86C450
o  Centronics printer interface
o  Independently controlled transmit, receive, line status, and data 
   set interrupts.
o  Programmable baud generator allows division of any input clock 
   by l to (2^16 -l) and generates the internal 16 x clock.
o  Independent receiver clock input.
o  MODEM control functions (CTS, RTS, DSR, DTR. RI. and DCD).
o  Fully programmable serial-interface characteristics:
   - 5, 6, 7. or 8-bit characters
   - Even, odd. or no-parity bit generation and detection
   - 1, 1.5 or 2-stop bit generation
o  False start bit detection.
o  TRl-STATE TTL drive capabilities for bidirectional data bus and 
   control bus on each channel
o  Internal diagnostic capabilities:
   - Loopback controls for communications link fault isolation
   - Break, parity, overrun, framing error simulation.
o  Fully prioritized interrupt system controls.

**W86C456   I/O controller [no datasheet]                            ?
**W860551/P UART with FIFO and Printer Port Controller             <94...
**
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